Answer for:

HDD not recognized after changing drive Letter

Message 2 of 23

You need to use the Safely Remove Option under all versions of Windows to Dismount the Drive or run the risk of Corrupting the Partition Tables.

You can try running Check Disc on the affected drive and it may repair the Partition Tables but depending on how Important the data on it is you may want to pay a Professional to Recover your Data. If it's only just Nice to recover the data run Check Disc without a second thought but if you must recover the Data send it to a professional as the more you unsuccessfully mess with it now the more expensive the recovery is going to be and the less likely you are to recover 100% of the data.